Journal Article

Rotational relaxation and excitation rates of hydrogen fluoride in collision with ortho- and para-H<sub>2</sub>

G. Guillon and T. Stoecklin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 1, pages 579-584
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20065.x
Rotational relaxation and excitation rates of hydrogen fluoride in collision with ortho- and para-H2

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We report de-excitation (and excitation) rate coefficients based on previous time-independent close-coupling scattering calculations for the rotational transitions of the hydrogen fluoride (HF) induced by collision with the two nuclear spin isomers ortho- and para-H2. These calculations were realized with the use of a new global four-dimensional potential energy surface recently computed by our group. We consider transitions for HF rotational levels up to jHF= 7, and for H2 levels up to = 3 (ortho-H2) and = 2 (para-H2). Rates are calculated for a range of temperatures up to 150 K. Our results show a strong difference of behaviour between ortho-H2 and para-H2 and validate the much stronger efficiency for the quenching of HF in collision with H2 in comparison with He.

Keywords: molecular data; molecular processes; scattering; astronomical data bases: miscellaneous; ISM: abundances; dark ages, reionization, first stars

Journal Article.  4399 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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